2007/06/14

Ohm's law states that, in anelectrical circuit, thecurrentpassing through a conductor from one terminal point on theconductor to another terminal point on the conductor is directlyproportionalto thepotential difference(i.e. voltage droporvoltage) across the two terminal points and inversely proportional to theresistanceof the conductor between the two terminal points. In mathematical terms, this is written as:

where Iis the current,Vis the potential difference, andRis a constant called theresistance. The potential differenceis also known as thevoltage drop, and is sometimes denoted byEor Uinstead ofV. [1]The SI unit of current is theampere; that of potential difference is thevolt; and that of resistance is theohm, equal toone volt per ampere